feat: add GPU-backed raster surfaces and effects#14
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Adds an optional GPU rendering path behind
RenderContextGPU preferences, withRasterImageable to carry either CPU pixels or backend-owned GPU surfaces. CPU fallback stays in place for every path, so existing renderers keep working when GPU initialization is unavailable.tellur-core:RasterImagenow supports opaque GPU surfaces alongside CPU images, andRenderContextexposes GPU preference / backend hooks plus readback for CPU-only consumers.tellur-renderer::gpu(new): wgpu backend for GPU-local RGBA surfaces, source-over compositing, drop shadows, outlines, readback, and Vello-backed vector rasterization.Rasterizenow tries GPU vector rasterization when the context prefers GPU, then falls back to the existing tiny-skia CPU path.DropShadow,Outline, and layer compositing route through the GPU backend when available, while preserving the existing CPU implementations as fallback.CachingRenderContextrecords GPU availability and per-operation counts (composite,shadow,outline,rasterize,readback) so live/demo output can show whether GPU work is actually happening.tellur-liveexposes GPU preference from the render context so demos can opt into GPU use without changing element code.